Simulated Work Resources Analysis

The Work resource statistics window (Figure 1) is used to analyze statistical data on simulated work resources. The window can be viewed from:

  • the Simulation Properties Window (see the Work Resource Statistics Tab article). Select the resource there and click on the View details hyperlink.
  • the Simulated process statistics or Simulated sub-process statistics window (see the Work Resources Used Tab article). Select the resource there and click on the Work resource statistics hyperlink.

The Work resource statistics window will be opened (Figure 1).

Figure 1. Work resource statistics window

Work Resource Overload

Analyze the Overload property to find resources whose instances are overloaded. The resource instance is considered to be overloaded in case this property value is more than 0:00:00. This means that simulated work resource instances failed to perform all the tasks that they were supposed to, even though they worked 100% of their available time. You need to increase the number of this resource instances.

The number of additional required instances is calculated for these resources.

In case the Overload property is equal to 0:00:00, pay attention to the value of the Avg time spent by task instance in queue property. The property displays the time spent by simulated task instances in the queue because resource instances were unable to perform them. The resource is considered to be a "bottleneck" if this property value is not equal to 0:00:00. This means that work resource instances cannot start performing task instances immediately when they arrive. The reasons may be the following:

  • work resource instances are not available according to the calendar at the time when the task instance arrives;
  • task instances arrive very often, and at the time of their arrival work resource instances are busy performing other tasks.

As a result, task instances are stocked in the work resource queue, and their "waiting in queue" time is increased.

Use the following properties to analyze the work resource queue:

  • Avg number of task instances in queue
  • Avg queue length
  • Max number of task instances in queue
  • Max queue length

Those work resources instances that have the maximum values of these properties can also be "bottlenecks".

Work Resources That Are Underloaded

Use the Percentage utilization property value to analyze the load of the simulated work resource instances. Value of this property is optimal, if it is equal to 80%. If its value is less, simulated work resource instances spent a lot of time doing nothing during the simulation period.

Analyze Use of Work Resource Instances (Processes Tab)

Use the Processes tab to analyze how the simulated work resource instances were used during the simulation period. The tab properties are the same as those of the Work resources used tab. See the Work Resources Used Tab article for their detailed description.

Properties of the Processes tab can help you identify processes whose task instances spent the longest time in the queue of the work resource, that led to the long processing time.

Select a process and click on the Process statistics hyperlink to open the Simulated process statistics or Simulated sub-process statistics window. See the Simulated Processes and Tasks Analysis article for details.

Analyze Utilization of Work Resource Instances

Use the Utilization of work resource instances tab to analyze instance percentage utilization (Figure 2).

Figure 2. Utilization of work resource instances tab

Resource Instance Working Chart

Select the work resource instance and click on the Resource instance working chart hyperlink. The chart will be opened (Figure 3).

Please note that working chart of any resource instance can be viewed only immediately after the end of the simulation before its saving.

Figure 3. Resource instance working chart

Legend:

Grey color – nonworking time according to the calendar;

White color – idle time;

Green color – working time.

Hovering the mouse over a cell displays information about the exact actions of the simulated resource instance at a particular moment of time.

Note that time used by simulated work resource instances to perform IDEF0 functions that are not decomposed, is not included into the load of the work resource instances.

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